antitheft cdi resistor wattage? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 67 (permalink) Old 03-24-2018, 08:27 PM Thread Starter
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antitheft cdi resistor wattage?

hey y'all I've hit the search bar pretty hard and couldn't find any relevant information related to this wiring job.. so the question is this.
when bypassing the antitheft bit,the b/w wire at the cdi box.

would it be advantageous to use a 90 ohm 5watt resistor or a 90ohm 0.25watt resistor?

as far as i know in this application the watts would matter very little,but i am running a very minimal harness with inline breakers and would hate to cook my cdi box because i was too proud to learn different..
any help on the matter would be appreciated!

2002 vn750
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post #2 of 67 (permalink) Old 03-24-2018, 09:38 PM
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What?
Huh?

Anti theft? Who would steal this bike?

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post #3 of 67 (permalink) Old 03-24-2018, 09:41 PM
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Just making sure we're talking about the same thing ... there are "lockout" and "interlock" circuits, which are not a theft deterrent devices, but nanny-style checks to make sure the bike won't move in an unsafe configuration (i.e. won't move with the kickstand down, won't start with torque directed to the wheels). The black/white wire connecting the cdi/ignition coil ignitor box to the fuse/junction box is certainly part of the interlock system (clutch lever/neutral switch/kickstand), and the cdi box needs to find a path to ground on the pin you mentioned (black/white wire, pin 5).

The downstream components don't provide any resistance other than the natural resistance of the wires, so I don't think that it's necessary to add in anything special. The CDI probably has built-in resistors.

In the thread how to truly fix the vulcans electrical problems, mcinturff states that pin 14 on the junction box (the other end of pin 5 on the cdi) should be grounded. It's just briefly mentioned in comment #2.

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post #4 of 67 (permalink) Old 03-24-2018, 09:43 PM
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Quote:
Originally Posted by Knifemaker View Post
What?
Huh?

Anti theft? Who would steal this bike?
Go ahead and leave your keys in the ignition, KN. I need a parts bike!

1992 US-nonCA * tuxedo mod * r/r relocated

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post #5 of 67 (permalink) Old 03-25-2018, 03:39 PM Thread Starter
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well thats part of the problem,I've done away with the nanny crap but i also ditched the entire ignition setup. i have a black/white wire on my cdi box that looks like its the one that needs resistance for the bike to get spark. its hard to explain but i think its the ignition antitheft..
as far as actual theft if they can't away while pulling a 6ft trailer and using hand clutch hand shift setup they can ****ing have it lol they obviously need it more than me.

2002 vn750
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post #6 of 67 (permalink) Old 03-25-2018, 03:46 PM Thread Starter
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when it warms up a little I'm going to go ahead and slap it back together sans resister and see if it fires,if its a dud than back to the drawing board!

2002 vn750
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hand clutch
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post #7 of 67 (permalink) Old 03-25-2018, 07:30 PM Thread Starter
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is it possible it needs a diode not a resistor on the 5pin on the cdi box? thats really the part that I'm stumbling on.

2002 vn750
hocked goat
single carb
dope ass suicide shifter
hand clutch
emmisions axed
bitchin stereo
permanent trailer containing charging system
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post #8 of 67 (permalink) Old 03-25-2018, 08:43 PM
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The interlock shouldn't need anything except a straight path to ground from pin 5. What other wires do you have connected to the box? It's possible there's something else misconfigured.

Does the starter motor crank? Does the engine ever start, but fails to keep running? Have you checked for any spark at the plugs?

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post #9 of 67 (permalink) Old 03-25-2018, 09:03 PM Thread Starter
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the starter is on a momentary switch independently,cranks but no spark.

so you think it should just be grounded at 5? i stripped the harness away leaving not much more than the coils the wires from coil to cdi,from cdi to pickups. no r/r no indicator lights the stator isn't connected anymore and there is no central fuse block.

2002 vn750
hocked goat
single carb
dope ass suicide shifter
hand clutch
emmisions axed
bitchin stereo
permanent trailer containing charging system
beer cooler backrest
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post #10 of 67 (permalink) Old 03-25-2018, 10:49 PM
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Ok, looking at the schematic, it looks like you need:

1) pin 1 to have voltage from the kill switch
2) voltage to the coils from the kill switch
3) pin 1 to coil 2
4) pin 4 to coil 1
5) start button voltage to pin 2 (nobody is quite sure what the cdi does with this)
6) ground pin 6 (stock harness grounds this)
7) ground pin 5 (to bypass stock interlock)
8) pins 7 & 9 to pickup coil
9) pins 8 & 10 to pickup coil

So, basically you need all of the wiring surrounding the CDI to be just like stock, except pin 5 can be grounded. Can you verify that you're getting voltage at pin 3 when the ignition is on, and at pin 2 when the start button is pushed? Does your tachometer move at all when you're cranking the starter button?

1992 US-nonCA * tuxedo mod * r/r relocated

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Service Manual Download
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